On first launch, on initial screen, there is only one button "Create master password". So user's only option is to create master password. But what if he wants to open already encrypted password file? He has to create master password, then click "Import passwords", and only then he will be able to use the file he intended. There is an extra step of creating master password, and then basically throwing it away.
Instead, there should be an additional button on initial screen, "Import passwords". By clicking on it user will go to import passwords screen directly, where he can select an encrypted file, enter password for encryption, and he will go straight to main screen, without creating master password
On first launch, on initial screen, there is only one button "Create master password". So user's only option is to create master password. But what if he wants to open already encrypted password file? He has to create master password, then click "Import passwords", and only then he will be able to use the file he intended. There is an extra step of creating master password, and then basically throwing it away.
Instead, there should be an additional button on initial screen, "Import passwords". By clicking on it user will go to import passwords screen directly, where he can select an encrypted file, enter password for encryption, and he will go straight to main screen, without creating master password